Fix the keyboard!
It is impossible to compose email with the app due to keyboard issues. The app changes random letters to symbols, deletes part of what is typed at random, and will not let you correct it. This is obviously not a phone or keyboard issue, as many other people have posted the same issues. This is a problem with your app, plain and simple.
Try a different Keyboard. I use Kika myself, based on stock keyboard's don't work very well. Also, most Multimedia Boards will pull up a symbol if you hold the key press to long. ↓←»★?¿?
Or your pointer speed could be set to fast.
App doesn't have basic input features common across devices. Won't automatically capitalize first word of sentence, the letter i, or place a period after a double space. Why is the yahoo mail app behind the rest of the technology world? I was having similar input problems as above and at least that has been corrected.
Was beginning to think it was just me! For me its the spacebar that won't work so can't send any emai!sthrough the app astheyallappearlikethis.